Gland-packing.



No. 739,995. PATENTED SEPT. 29, 1903.

J. DBWRANGE. I GLAND PACKING.

' APPLICATION FILED HA3. 6, 1903. N0 MODEL.

' ZZZ II nu: NORRIS PEYERS ca. wnnroumu. war-warm, u. r..

Fatented September 29, 1903.

PATENT OFFICE.

JOHN DEWRANOE, OF SOUTHWARK, ENGLAND.

GLAND-PACKING.

SPECIFICATION forming part of Letters Patent No. 739,995, dated September 29, 1903. Application filed March 6, 1903- Serial No. 146.527- (N0 model.)

To aZZ whom it may concern.-

Be it known that I, JOHN DEWRANCE, a subject of the King of Great Britain and Ireland, residing at 165 Great Dover street, Southwark, in the county of Surrey, England, have invented an Improved Gland-Packing, of which the following is a specification.

This invention relates to packings adapted for use in ordinary glands through which rods, spindles, gage-glasses, and the like pass, but is also applicable in packing the plugs of cocks and other bodies with a view to ren dering them tight under steam or other fluid pressure.

The accompanying drawings illustrate packings constructed according to my improved method. I I

Figure l is a face view of one form of the packing, the upper ring having been removed. Fig. 2 is a transverse section on the line w x in Fig. 1. Fig. 3 is a face view of another form of the packing, Fig. .4. being a similar view with the upper ring removed whileFig. 5 is a transverse section on the line y y in Fig. 3.

Assuming the invention to be applied to an ordinary gland, the improved packing comprises two rings a, a, each formed with a groove in one of its faces and arranged with their grooved faces opposite one another, the space formed by the two grooves being occupied by a solid ring 12. The rings a a, are composed of asbestos fiber and india-rubber vulcanized to a hard condition, while the solid ring I) is formed of india-rubber and asbestos, plumbago, or other suitable powder mixed in such proportions as to render the product when vulcanized comparatively soft and yielding. On such a packing being subjected to pressure in an axial direction the ring or core I), of soft rubber, yields in the direction of the pressure, but in so doing exerts a lateral or radial pressure upon the walls of the rings a a, with the eifect that they are forced into intimate contact with.

the Wall of the inclosing gland and with the surface of the spindle, rod, gage-glass, 01- other stem to which the gland is applied. The rings a a mayassume various external shapes, such as cylindrical, as shown in Figs. 1 and 2, or hexagonal, as represented in Figs. 3, 4, and 5, according to the particular uses to which they are applied.

' What I claim as my invention, and desire to secure by Letters Patent, is-

1. The herein-described packing for stuffing-boxes and the like, consisting of two rings composed of flexible material placed face to face and having annular grooves in their adjacent faces and a solid core of soft yielding substance occupying the cavity formed by the two grooves.

2. The herein-described packing for stuifing-boxes and the like consisting of two rings.

a a composed of a vulcanized mixture of asbestos fiber and india-rubber, and having grooves in their adjacent faces,"in conjunction with a solid core b arranged to occupy the cavity formed by the grooves and composed of avulcanized mixture of india-rubber and plumbago orequivalent powder adapted to render the said core comparatively soft and yielding, substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence 0 two subscribing witnesses.

JOHN DEVVRANCE.

Witnesses: V

PERCY E. MATTOOKS, WM. 0. BRADY. 

